// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2022 Google */ #include "vmlinux.h" #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> struct bpf_testmod_btf_type_tag_1 { int a; }; struct bpf_testmod_btf_type_tag_2 { struct bpf_testmod_btf_type_tag_1 *p; }; __u64 g; SEC("fentry/bpf_testmod_test_btf_type_tag_percpu_1") int BPF_PROG(test_percpu1, struct bpf_testmod_btf_type_tag_1 *arg) { g = arg->a; return 0; } SEC("fentry/bpf_testmod_test_btf_type_tag_percpu_2") int BPF_PROG(test_percpu2, struct bpf_testmod_btf_type_tag_2 *arg) { g = arg->p->a; return 0; } /* trace_cgroup_mkdir(struct cgroup *cgrp, const char *path) * * struct cgroup_rstat_cpu { * ... * struct cgroup *updated_children; * ... * }; * * struct cgroup { * ... * struct cgroup_rstat_cpu __percpu *rstat_cpu; * ... * }; */ SEC("tp_btf/cgroup_mkdir") int BPF_PROG(test_percpu_load, struct cgroup *cgrp, const char *path) { g = (__u64)cgrp->rstat_cpu->updated_children; return 0; } SEC("tp_btf/cgroup_mkdir") int BPF_PROG(test_percpu_helper, struct cgroup *cgrp, const char *path) { struct cgroup_rstat_cpu *rstat; __u32 cpu; cpu = bpf_get_smp_processor_id(); rstat = (struct cgroup_rstat_cpu *)bpf_per_cpu_ptr(cgrp->rstat_cpu, cpu); if (rstat) { /* READ_ONCE */ *(volatile int *)rstat; } return 0; } char _license[] SEC("license") = "GPL";